Exhaust-muffler.



C. A. ORB. EXHAUST MUPPLER. APPLICATION FILED JULY I, 191s.

1,131,543. Patented Mar. 9, 1915.

CHESTER A. OBR, F CLEVELAND, OHIO.

EXHAUST-MUFFLER.

Specification of Letters Patent.

Patented Mar. 9, 31915.

Application :tiled July 1, 1913. Serial No. 776,8430.

` To all whom t may concern:

Be it known that I, CHESTER A. ORR, a citizen of the United States, and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Exhaust-Mufflers, of which the following is a specification.

My invention relates to muiiiers and has particular reference to a novel exhaust muffler for use on hot blast stoves.

In the operation of a blast furnace, the opening of relief valves in the hot and cold blast mains or of the blow-olf valves in the hot blastI stoves to permit the escape of pressure is accompanied by a deafening noise; and, further, much dust and. small particles of solid matter are ejected with the exhaust.

One of the principal objects in the present invention is to provide a muliier which shall eliminate the noise thereby protecting the ears of the operator or those subjected to its effect. The effect is to cause a degeneration of the nerve endings of theauditory nerves and thereby a decreasing eliiciency of the hearing. In the case of blast furnace operations, the hot blast stove operator is subject to the damaging eii'ect, and at first most of them make an effort to protect their ears with their hands, fingers or some cotton, but in most cases this is neglected sooner or later, owing to the ears becoming accustomed to the noise, which means a deadening of the nerves.

An advantage is secured indirectly by eliminating the noise in that such noise is generally of an intensity as to make all other operations near it extremely dangerous. In the case of exhaust from hot blast stoves it is impossible to carry on a conversation even by shouting or to hear any other noises characteristic of such plants which may or ma not arise from irregular conditions.

further object is by the use of my mufer to eliminate falling particles of dust accompanying the relief under high velocity.

The invention will be more readily understood by reference tothe accompanying drawings, wherein,-

Figure 1 is a side elevation of a muffler constructed in accordance with my invention, and, Fig. 2 is a vertical section taken at right angles to the view of Fig. 1.

Referring more particularly to the drawings, it will be seen that the muffler is secured to the shell 10, of a hot blast stove, the connection being through a. casting 11, which has secured thereto an elbow 1:2, by a hinged connection 11. YThe elbow is provided with a valve seat 13, with which cooperates a valve 14, controlled by a hand Wheel, as well understood.

Mounted on the upper flanged end of the elbow 12, is the muffler, in `the form offan inverted truncated cone, the casing 16, being formed of sheet steel, the lower end being secured to the flanged casting 17, provided witha hinge 18. By this construction the niuliler may be swung outward for inspection and cleaning as desired. Mounted transversely within the cone 16 are screens 19, arranged in pairs, between which screens is placed a quantity of loose material such as gravel, silica or small particles of iron or steel. The space between the -screens may be filled through the plug openings 20. Also provided in the sides of the cone 16 are hand holes 21, to give access for cleaning when desired. I deem it advisable also to provide an auxiliary outlet or unmullled relief port whereby the operator may make certain that all the pressure is out of the stove before the doors are opened. This may consist in the extension 22, having an upwardly extending elbow 23, secured thereto, the escape of air being controlled by a suitable valve 24. Also communicating with the elbow 12 by means of a suitable pipe 25, is a gage 26, by means of which the operator may determine the pressure within the mufller.

It is obvious that the construction shown is very simple, may be easily maintained in repair and provides a relief from the excessive noise commonly experienced around blast furnaces. The air may escape through the layers of loose material into the gradually increasing space, its expansion and escape being permitted without noise. Furthermore, all the dust or loose particles in the blast are filtered out thus preventing their escape into the atmosphere.

It is obvious that modifications may be made and such modifications as are within the scope of my claims I consider within the spirit of my invention.

I claim:

1. In a device of the class described, the

aia

combination with alhot blast stove of a rev lief valve therefor-,'means for actuating the valve disk in opening and closing said valve, a hollow truncated cone having its small end secured to thev outlet of said relief valve and having its large end opening into. the atmosphere, a series of pairs of transversely extending foraminous disks secured at vspaced apart intervals within said cone to form expansion chambers therein, andfinely dividedsolids 4filling the space between the adjacent disks forming leach pair. i

2. ln a device of the class described, the

combination with a hot blast stove of a'` relief valve therefor, means for actuating the valve .disk in opening and closing said valve, a hollow truncated cone having its small end secured to the outlet `of said relief valve and having its large end opening into the atmosphere, at least two pairs of transversely extending foraminous disks secured at spaced apart intervals wlthln said cone to form expanslon chambers therein, and

finely divided solids illing'the space be'- tween the adjacent disks forming each pair.

3; In a device ofthe class described, the combination with a hot blast stove of a relief valve therefor, means for actuating the valve disk in opening and closing said valve,

CHESTER A. ORB.

Witnesses:

M. T. LLOYD, H. J. MAGKAY. 

